Questions: The Lewis representation above depicts a reaction between hydrogen (blue) and a main-group element from group (red). In this representation, each Y atom needs electron(s) to complete its octet, and gains these electrons by forming bond(s) with atoms of H. There are unshared electron pair(s) and bonding electron pair(s) in the product molecule. The bonds in the product are .

The Lewis representation above depicts a reaction between hydrogen (blue) and a main-group element from group (red). In this representation, each Y atom needs electron(s) to complete its octet, and gains these electrons by forming bond(s) with atoms of H. There are unshared electron pair(s) and bonding electron pair(s) in the product molecule. The bonds in the product are .
Transcript text: The Lewis representation above depicts a reaction between hydrogen (blue) and a main-group element from group (red). In this representation, each $\mathbf{Y}$ atom needs $\square$ electron(s) to complete its octet, and gains these electrons by forming $\square$ bond(s) with atoms of H . There are $\square$ unshared electron pair(s) and $\square$ bonding electron pair(s) in the product molecule. The bonds in the product are $\square$ .
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Solution

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Solution Steps

Step 1: Identify the Main-Group Element

The main-group element \( \mathbf{Y} \) is from group 16 (the chalcogens), which includes elements like oxygen (O), sulfur (S), etc.

Step 2: Determine the Number of Electrons Needed for Octet

Each \( \mathbf{Y} \) atom needs 2 electrons to complete its octet. This is because group 16 elements have 6 valence electrons and need 2 more to reach 8.

Step 3: Determine the Number of Bonds Formed

Each \( \mathbf{Y} \) atom gains these 2 electrons by forming 2 bonds with hydrogen atoms.

Step 4: Count Unshared and Bonding Electron Pairs in the Product

In the product molecule, there are 2 unshared electron pairs on the \( \mathbf{Y} \) atom (since it originally had 6 valence electrons and used 2 for bonding, leaving 4 electrons or 2 pairs unshared). There are also 2 bonding electron pairs (each bond with hydrogen involves a pair of electrons).

Step 5: Identify the Type of Bonds in the Product

The bonds in the product are covalent bonds, as they involve the sharing of electron pairs between \( \mathbf{Y} \) and hydrogen atoms.

Final Answer

\[ \begin{aligned} &\text{Each } \mathbf{Y} \text{ atom needs } \boxed{2} \text{ electron(s) to complete its octet.} \\ &\text{Each } \mathbf{Y} \text{ atom forms } \boxed{2} \text{ bond(s) with atoms of H.} \\ &\text{There are } \boxed{2} \text{ unshared electron pair(s) in the product molecule.} \\ &\text{There are } \boxed{2} \text{ bonding electron pair(s) in the product molecule.} \\ &\text{The bonds in the product are } \boxed{\text{covalent}}. \end{aligned} \]

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